// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
#pragma once

#include <pollux/common/base/exceptions.h>

#include <cmath>
#include <iostream>
#include <sstream>
#include <string>
#include <unordered_map>
#include <melon/container/f14_map.h>

namespace kumo::pollux::expression::calculate {
    class Scanner : public yyFlexLexer {
    public:
        Scanner(
            std::istream &arg_yyin,
            std::ostream &arg_yyout,
            melon::F14FastMap<std::string, int> &values)
            : yyFlexLexer(&arg_yyin, &arg_yyout), values_(values) {
        }

        int lex(Parser::semantic_type *yylval);

        void setValue(const std::string &varName, int value) {
            values_[varName] = value;
        }

        int getValue(const std::string &varName) const {
            POLLUX_CHECK(values_.count(varName), "Variable {} is not defined", varName);
            return values_.at(varName);
        }

    private:
        melon::F14FastMap<std::string, int> &values_;
    };
} // namespace kumo::pollux::expression::calculate
